I just bought a 76 55. I only have the carb while I am waiting for the truck o get shipped. What size jets are recommended at our elevation? I searched on mud and did not get an answer that made sense.

The stock jetting will work, though if you really want to get into it you will need a wide band o2 sensor installed and fine tune specifically for your carb. Check SOR for stock settings for your year, they change every year almost.